br: enable backup checksum for internal testing. #57472
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component/br
This issue is related to BR of TiDB.
type/enhancement
The issue or PR belongs to an enhancement.
Enhancement
we turned off the backup checksum in this change #56712, but recently we found that the checksum helped us to catch a bug before new releases, so it's still vital to turn it on in our internal testing but can keep it off in prod to improve performance.
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